keytool -genkey -dname "cn=WonTube Studio, ou=Java Software, o=WonTube Studio, c=China" -alias wontube -keypass wontube -storepass wontube -validity 365 -keystore wontube
keytool -list -keystore wontube -storepass wontube
jarsigner -verbose -keystore wontube yt-mp3-converter-1.0.0.jar wontube